Good shot! I've always been partial to Sydney Harbour shots - I think it's one of the most beautiful man made places on Earth. You've captured it well (from Circular Quay I assume?), about the only thing I'd suggest is a little rotation - try about 2°CW, I think the water should be your horizontal, rather than the bridge! There are a few small patches of overexposure, but it's almost impossible to get a scene like this perfectly exposed in only one shot - about the only real solution would be maybe using CS2 and the HDR feature, perhaps. Anyway, nicely captured :-D

I like this one better than the other bridge shot mainly because it has the whole bridge in it. The lights and colors in this one is great. Good exposure.
I agree with Adrian that the water should be more horizontal. Might improve the shot. But well done.